Pattern:

I used “Magic Adjustable Loop” to make a loop, then chain 3 stitches and turn that into a double chain. 5 more dc and then I pulled the loop closed and closed the circle with a sc. 2 dc into each stitch for a total of 12, close the circle with a sc and then repeat the process again.

sc into the back loop of the circle all the way around. Then, chain 2 loops, skip a loop, double chain, skip a loop, all the way around. There should be a series of loops. chain three, then tc into the center of each loop, chain 3, repeat around and around until the bag is tall enough to cover the yoga mat. sc into each stitch. one circle of tc and then finish. For the draw string, I just made a long chain and wove it through the tc.

For the strap (not pictured) I just dug in a couple stitches at the bottom, went all the way to the top, back and forth a couple times, bam.